RPNu 10.5 - App Store

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About RPNu

RPNu is a calculator that makes crunching numbers easier than it’s algebraic equivalent. RPN stand for Reverse Polish Notation (The ‘u’ stands for universal, meaning it runs on both the iPad and iPhone.) and is the...

RPNu is a calculator that makes crunching numbers easier than it’s algebraic equivalent. RPN stand for Reverse Polish Notation (The ‘u’ stands for universal, meaning it runs on both the iPad and iPhone.) and is the numeric evaluation method used for this app. RPN, I feel, is far superior to the algebraic method and once learned you will never want to use the algebraic again. This calculator has all the normal mathematical function, but also contains a host of other functions that you may find very useful. Space is limited in this description but here are the highlights: Help: There is extensive help to aid the user in determining how to use this app. It is also context sensitive. Programable: You can write your own programs and there are many tools to aid you in doing this. Graphics: You can graph equations and there are several modes to cover almost all requirements. A universal converter that you will find very useful. Matrix arithmetic (determinate, invert, add, subtract and multiply). Date calculator and an hours calculator with moon phase display. Elements and periodic table information. Combinations and permutations calculator Equation integration and root finder. Amortization with many useful functions. Mapping function that allows you to determine distance between points and other functions. Hyperbolic functions. Hexadecimal, Octal, and Binary modes. Barometer function showing QNE and QNH. A compass that not only shows magnetic and true north, but also shows the address you are at. This app includes extensive support for a Bluetooth keyboard. Also, extensive support is given to export your calculations to either email or the universal clipboard.

Version History Added some function to the graphics function and updated the documentation. 10.5 05/19/2025 Corrected some minor bugs and updated documentation. 10.4 05/01/2025 I have modified the layout to accommodate the iPhone 16 camera that is unique in being lower on the display than the other iPhone models. Some bug fixes. 10.3 10/19/2024 There is a bug in the barometer function that happened because of an iOS update. I have disabled this function until I can get it fixed. 10.1 06/20/2024 Corrected an error in the days between dates function. Also, some user interface improvements. 10.0 04/04/2024 Improved function to the Map and Days (Other Functions). Additional information added to the help file. 9.8 03/16/2024 Some improvements to the user interface, updated documentation and a few bug fixes. 9.7 12/21/2023 Some improvements to the user interface and a few bug fixes. 9.6 12/09/2023 Corrected a few bugs. Updated some of the documentation. 9.4 10/05/2023 Corrected some bugs in the programming section and some improvements to the user interface. 9.3 07/03/2023 Some important bug fixes and a few improvements to the user interface. 9.2 05/23/2023 Improved User Interface, some bug fixes and help file updates. 9.0 05/11/2023 Some bug fixes and interface improvements, especially in the Statistics Function. 8.4 03/22/2023 I have corrected a number of important bugs in the mapping functions for this app. 8.3 02/13/2023 Some bug fixes and interface improvements. Also, some code modifications for better performance. 8.2 01/26/2023 Improvements in the user interface and some additional functions and bug fixes. 8.0 12/11/2022 A few bug fixes. Added some calendar capabilities and updated some user interface issues. 7.9 11/20/2022 A few bug fixes and improved user interface. 7.8 09/09/2022 Corrected a few bugs and an improved user interface. 7.7 05/29/2022 Some additional features added and a few bug fixes. 7.5 01/07/2022 Corrected a bug in the version number of the program and submission requirements. 7.4 12/01/2021 Corrected a number of bugs and improved the user interface in a number of the functions in the app. 7.3 11/23/2021 Fixed an important bug. Improved user interface for several functions. 7.1 11/11/2021 Some important bug fixes and additions to the built in program library. 7.0 11/03/2021 Some bug fixes and additions to program utilities. Also, compliance with Apple's procedures for allow location services. 6.9 10/29/2021

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Previous Versions

Here you can find the changelog of RPNu since it was posted on our website on 2017-01-23 14:30:41. The latest version is 10.5 and it was updated on 2026-06-22 10:33:22. See below the changes in each version.

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